( Reaffirmed 2005 ) IS : 6085- 1979 Indian Standard DIMENSIONS FOR 35 mm MOTION PICTURE FILM ( Cinematographic First Revision ) Equipment Sectional Chairman SHRl Committee, ETDC 47 B. A. MISTRY Pearl Mansion, Queens Road, Bombay 400020 Members Representing Cinecita Private Limited, Bombay SHRI S. N. ACARWAL SHRI S. P. AGARWAL ( Alternate ) Department of Teaching Aids, National Council of SHRI N. P. BHATTACHARYA Educational Research and Training, New Delhi Cine Sales Corporation, Delhi SHRI Y. R. CHAUHAN SHRI R. S. CHAUHAN( Alternate ) Devi Cine Projector Mfg Co, Madras SHRI K. RAJAGOPALCHETTY SARI K. N. GNANAPRAGASAM ( Alternate) National Physical Laboratory ( Acoustics Division ) DR A. F. CHHAPGAR ( CSIR ), New Delhi Cine Mechanical Works, Calcutta SHRI BEUPON Grros~~ SHRI MANNA LADIA ( Alternate ) Ministry of Defence, ( DGI ) MAJ S. P. M~JRG.U MAJ V. B. DESHMUKH ( Alternate ) Directorate General of Technical Development, SHRI K. N. RAMASWAMY New Delhi SHRI BALRAJ BHANOT (Alternate) Photophone Private Limited, Bombay SHRI 8. RAMESH SHRI A. B. KUCHERIA ( Alferrzate) National Physical Laboratory ( Optics Division ) SHRI RAM PRASAD ( CSIR ), New Delhi Directorate General of Supplies & Disposals, SHRI M. SANKARALIXGAM New Delhi SHRI G. R. BHATIA (Alternate) Hindustan Photo Films Mfg Co Ltd, Ootacamund SHRI P. R. K. SARMA SHRI A. KRISHNAMURTIIY ( Alternate ) ( Continued on flap 2 ) @ Co&right 1980 INDIAN STANDARDS INSTITUTION This publication is protected under the Zndian CoPyright Act (XIV of 1957 ) and reproduction in whole or in part by any means exe t with written permission of the "ip copyright under the raid Act. publisher shall be deemed to be an infringement o IS:6085-1979 (Cofltinuadfhnpaga 1) Members SHRI S. B. THAKAR SHRI P. V. K. REDDY ( Akmntc SHRI G. G. VASWANI SHRI S.".P. SACHDEV, Dire&or ( Elec tech ) Film ) Films Repranting & TV Institute of India, Ministry Information and Broadcasting, Pune of and Division? Ministry of Information Broadcastmg, Bombay Director General, IS1 ( Ex-e&i& Member) Secretary KUMARI G. M. JOSEPH Assistant Director ( Elec tech ), IS1 2 IS:608511979 Indian Standard DIMENSIONS FOR 35 mm MOTION PICTURE FILM ( First Revision) 0. 0.1This Indian FOREWORD First Revision ) was adopted by the Indian April 1979, after the draft finalized bv the Sectional Committee had been approved by Council. Standard ( Standards Institution on 6 Cinematographic Equipment the Electrotechnical Division 6.2 Work on the formulation of standards for various cinematographic equipment has been undertaken with a view to establishing acceptance levels of quality and performance as well as bringing about a degree of interchangeability in these units, this standard is one of the series of Indian Standards on cinematographic equipment. 0.3 This revision was undertaken, based on the experience gained in the use of this standard and the subsequent revision of the corresponding IS0 standard ISO/DIS 49 1. 0.4 In preparing this standard assistance has been derived from Draft International Standard ISO/DIS 491 " Cinematography - 35 mm motionpicture film and magnetic film - Cutting and perforating dimensions " Organization ( Revision of ISO/R 491- 1974 ) issued by the International for Standardization. 0.5 The revision: following major modifications have been incorporated in this a) New dimensions the requirements between perforations have been specified to fulfil of continuous sprocket contact printing. b) Supplementary information have been included on uniformity of perforations and choice of longitudinal pitch for negative films for the benefit of the user ( see Appendix A ). 3 IS : 6085 - 1979 0.6 For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test shall be rounded off in accordance with IS : 2-1960*. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard. 1. SCOPE 1.1 This standard covers the cutting and perforating dimensions for 35 mm motion picture raw stock film. 2. TYPE OF PERFORATIONS AND DIMENSIONS 2.1 The dimensions of the film shall conform to the value specified in Table 1 ( see Fig. 1 ). A w Ef=k 0 0. 0 0 0 I 0 0 I m I 0 0 0 S. FIG. 1 *Rules fDr roundirlg F-J E E DIMENSIONS values ( wised ). 9- OF FILMS off numerical 4 IS : 6085 - 1979 2.1.1 The maximum variations be as specified in Fig. 2. between corresponding perforations shall FIG. 2 PERFORATIONS VARIATIONBETWEEN CORRESPONDING 2.2 The types of perforations shall be types P, N and AC, as given in Fig. 3, 4 and 5 and shall conform to the dimensions given in Table 1. cl cl Cl 0 cl Q 0 R n 0 Type P Q C FIG. 3 DIMENSIONS OF TYPE P PERFORATIONS 5 b:6085-1979 0 0 0 0 FIG. 4 0 0 0 0 Type N DIMENEIONS OF TYPE N PERFORATIONS 0 0 FIG. 5 Type AC DIMENSIONS OF TYPE AC PERFORATIONS 6 IS : 6085- 1979 `FABLE 1 DIMENSIONS OF RAW STOCK FILM ( CIawses2.1 and 2.2 ) All dimensions in millimetres. DIMENSIONS (1) TYPE P* (2) TYPE N (3) 34.975 & 0.025 475 f 0.01 TYPE AC (4) 34975 f PO25 A B 34975 f 8.025 4.75 f 0.01 4*75*0*01 1.98 f 1.850 + 4t c 474 -+ 0.01 2.800 + 0.005 - 0.015 1.98 f 2.01 f 0.01 0.05 474 -& 0.01 2'08 nominal 1.850 + 0*015 - 0.005 2*01& 0.05 25.37 f 0.05 0.01 D E F G - o-015 0.005 2.18f0.05 26.65 f 0.85 25.37 + 0.05 0.025 Max @025 Max 2.800 0,025 Max 0.33 f0.025 475.0 f 0.4 R - 0.015 0.4 0.4 + O'Oo5 LS L,S 475.0 f 0.4 475.0 f 474.0 f 474.0 & 0.4 NOTE -These dimensions apply to raw stock, unexposed safety motion picture films immediately after perforating and cutting. If required by usage, the manufacturer should indicate the atmospheric conditions while cutting. *While Type N may be employed for camera and intermediate films, Type P is for print films. Type P is recognized as preferred and should replace Type N in future. tDimensions B, and L, (short perforation ments of continuous sprocket contact printing. $Dimensions L and L,, corresponding 100 consecutive perforation intervals. pitch ) are provided to meet the require- to B and B, are representing the length of any 7 IS : 6085 - 1979 APPENDIX [ A Clause 0.5 ( b ) ] INFORMATION SUPPLEMENTARY A-l. UNIFORMITY OF PERFORATIONS A-l.1 The dimensions given in this standard represent the practice of film manufacturers in that the dimensions and their tolerances are for film stock The punches and dies themselves are made immediately after perforation. to tolerances considerably smaller than those given, but since the film is a plastic material, the dimensions of the slit and perforated film stock never agree exactly with the dimensions of the slitter knives, punches and dies. Film can shrink or swell due to loss or gain in moisture content, solvent or plasticizer. These changes invariably result in changes in the dimensions The change is generally uniform throughout a during the life of the film. roll. The uniformity of pitch, hole size and margin (dimensions B, C, D Variations in these and E) is an important variable affecting steadiness. dimensions from roll to roll are of little significance compared to variations Actually, it is the maximum variation from one sprocket hole to the next. from one sprocket hole to the next within any small group of consecutive perforations that is important. A-2. CHOICE FILMS A-2.1 The OF LONGITUDINAL PITCH FOR NEGATIVE choice of pitch for negative motion-picture films depends, within certain limits, on the type of printer to be used. Where stepprinters are used and the film is stationary when exposed, the choice of Where the film moves continuously over a pitch is not strictly limited. cylindrical surface at the time of printing ( sprocket-type printer ), there are three major considerations involved in choosing the pitch. These considerations are: 1) The sprocket diameter, and and the rate at which shrinking occurs. 2) The film thickness, 3) The film shrinkage Maximum steadiness and definition are secured on a sprocket-type printer when the negative stock is somewhat shorter in pitch than the positive stock in the approximate proportion of the thickness of the film to a IS I 6085 - 1979 the radius of curvature. For printing on a 64-tooth 35-mm sprocket, which is one with a circumference of about 30 cm, and with film O-140 to 0.165 mm thick, the optimum pitch differential is 0.3 percent. The use of the ideal pitch differential for the negative film would minimize slippage between the positive and negative film during the printing operation, thus reducing the amount of blurring and jumping of horizontal lines in the picture or sound image that otherwise can take place. (This error should be differentiated from the jump caused by non-uniformity of successive pitches B. ) Experience has shown that the average pitch L of the negative film can vary by f0.1 percent from the ideal pitch, which is 0.3 percent shorter than that of the positive film, without blurring of picture and sound being easily detected. For many years, this difference in pitch was caused by the shrinkage of the negative film during processing and ageing. Current film bases shrink less than the earlier ones and hence a shorter initial pitch becomes desirable. To satisfy this requirement for picture or sound-negatives, it is common manufacturing practice to set the aim for the pitch at a value 0.2 percent shorter than that of those positive films on which they will be printed. The additional shrinkage that occurs during processing and the ageing takes place before the release prints are made then brings the pitch differential close to the optimum and desired value of 0.3 percent. Accordingly, the pitch chosen is 4.74 mm. The longitudinal pitch dimensions for the perforation for type B correspond to O-2 percent reduced pitch. Low-shrink negative stock to be perforated to these dimensions should not therefore shrink appreciably more than 0.2 percent under normal conditions of use and for a reasonable life span, so that the optimum pitch differential from the positive stock of 0~3 f 0.1 gereent is maintained. INDIAN ON STANDARDS CINEMATOGRAPHIC IS: EQUIPMENT 1885 ( Part XXXIV )-1972 Electrotechnical vocabulary: Part XXXIV Cinematography 4495-1968 Method of measurement of light output of cineaatograph projectors (for narrow gauge film ) Screen luminance for the projection of 16 mm film by incandescant lamps 4496-1968 16-mm portable sound-and-picture cinematograph projectors (Jr& r&ion) 4497-1977 5260-1969 Buzz-track test film ( 16 mm ) Sound focusing test film ( 16 mm ) 5261-1969 Registration test film ( 16 mm ) 5262-1969 Multi-frequency test film ( 16 mm ) 5263-1969 3 OOO-Hzflutter test film ( 16 mm ) 5264-1969 Sound-and-picture test film ( 16 mm ) 5265-1969 406-Hz signal level test film ( 16 mm ) 5266-1969 Screen luminance for the projection of 35 mm tilm on matt and directional 5353-1969 screens 5636-1970 Cans for 16-mm projector spools 5679-1970 Methods of tests for still projectors 5674-1970 16-mm projector spools 5700-1977 Cinematograph screens yirst rsetiira ) 5778-1970 Still projectors 6084-1971 Dimensions for 16-mm motion picture film 6085-1979 Dimensions for 35 mm motion picture film (/irst revision ) 6095-1971 Cans for 35 mm motion picture films 6096-1971 Dimensions for sprockets for 35 mm motion picture projectors 6097-1971 Dimensions for corea for motion picture and magnetic films 6119-1971 Carbon arc lamps for motion picture projection 6561-1972 Buzz-track test film ( 35 mm ) 6562-1972 1060 Hz balancing and signal level test film ( 35 mm ) 6563-1972 Sound-focusing test film ( 35 mm ) 65641972 Scanning beam uniformity test film ( 35 mm ) 6933-1973 35 mm portable motion picture projectors 6937-1973 Overhead projectors 7390-1974 3 000 Hz flutter test film for 35 mm motion picture sound reproducers, photographic type 7397-1974 Guide for clectro-acoustic response of the final chain of motion picture sound reproduction system 7791-1975 Projector alignment test film for 35 mm motion-picture sound reproducers 7848-1975 Studio spot lights for use in motion picture studios